Milling machine



Feb. 14, 1928. 1,659,426

c. M. coNRADsoN MILLING MACHINE original Filed March 2o. 1920 esheets-Sheet 1 a VMM Feb. 14, 1928.

C. M. CNRADSON MILLING MACHINEv i Original F iled March 2Q.' 1920 6vSheets-Sheet 2 Feb.- 14, 1928. 1,659,426

C. M. CONRADSON MILLING MACHINE Original Filed March 20. 1920 6Sheets-Sheet 5 lOl Fb.14,192s'. Y 1659 426 c. M. coNRADsoN MILLINGMACHINE Original Filed March 20, 1920 6 Sheets-Sheet 4 wfg/f /WM H15ATTORNE YJS Feb. 14, 192s. 1,659,426

C. M. CONRADSON MILLING MACHINE Original Filed March 20. 1920 6Sheets-Sheet 5 CoA/e4 Miel/@MON Feb. 14, 1928.

C. M. CONRADSON MILLING MACHINE original Filed March 2o'. 1920eshets-S'heet v6 Il K v \\\\\lll Con dM Conra :son

H/J ATTO/ENE YJ.

Patented Feb. 14 1928.

CONRAD MI. CONRADSON, OF MADISON, WISCONSIN,

AssIGNon To JOSEPH T. Iwnnscm` a son, F CHICAGO, ILLINOIS, AcoRronATIoNoFILLINoI's.

MILLING MAcnInn Application ined March 2o, 1920, serial Np. 367,529.,Renewed February 1, 1924.

My invention relatesto improvements in variable speed drive mechanismfor the Working spindle of a milling machme and to variable speedmechanism for feeding the i'A work to the milling cutter in bothhorizontal and vertical directions, coupled with automatic stop andtraverse mechanism for the feed tableof the machine. y y

z The objects of the yinventionare: u: ,First, to provide a driving`mechanismof simple, durable and compact construction and a powerful,accurate, and silent power' transmission fromV the motive pov/er shaft.to the Working spindleof the machine. iii- Second, toprovide a variablespeed and power transmissionthat will be positively and instantlyresponsive to the speed-shift- ,ing medium and that may lbe shiftedW1thout the use of clutches to various speeds and fifi reverse while themachine is running.`

Other objects Will appear from the following detailed description, takenin connection with the accompanying drawings.

. The invention consists in various construc- "35 tions andcombinations, all ashereinafter described and particularly the claims. Y

In the accompanying drawingsrformmg part of this specification, 30Figure 1 is a vertical longitudinal section of a` milling machineembodying my invention, y .i i p ,Figure 2 is a similar section on alarger scale of the main column of the machine, :ia en'ibodying thedriving mechanism,

pointed out in Figure 3 is a transverse vertical section of the machineon the line 3 3 of Figure2, Figure 3 is a detail View of the gearshifter index and locking device,

Figure 4 is a similar section on the line 4-4 of Figure 2,

Figure 5 is alike sectionon thefline 5 5 of Figure 2, y y

Figure 6` is a section on a larger' scale on 45 the line 6`6 of Figure2, illustrating the locking device for the drive speed change gearings.

The4 `spindle drive.

:in` y Referring to Figures l to.6, lwhich illus trate `moreparticularlyY the main spindle driving mechanism, is the main frame orcolumn of the machine in the upper part of which the Working spindle 21is mounted 55 adjustably inV suitable bearings 22 and23.

The primary motor shaft 24 frolnwhich power is transmitted to thespindle 21 is journaled in ball bearings 25and 26 `Within a bonnet 27attached to a gearhousing 28, which in turn is securely fastened tothe-col umn 20 by bolts 28a (see Figure 3). The bonnet 27 isprovidedwvith a motor base casting 29 `to which an electric or othermotor 30, indicated by dotted lines in`Figure 1, may be attached andcoupled directly to the shaft 2 4. `The motor base 29 is interchangeablein the bonnet 27 with a pulley7 `guard (not shown) and a beltdrive`npulle (not shown) may be substituted on the shaft 24 as a motive powerin place of the motor 30. The shaft 24 extends through the bean ing 26mounted in the gear housing 28 and is rovided with a splinedportion 24aand a third ball bearing 26 in the housing 28.`

Slidinggears 31 and 32 arranged upon the y s`;,) lined portion 24atransmit` power from the shaft 24 to an intermediate shaft 33 in Valforward or reverse direction, as may be desired, by means of agear 34upon the shaft vmeshing with theslidmg gear 31 for forward rotation, andthe gear 32 meshing with .an idler gearf35, loosely journaled upon astud 36, as shown in Figure 3, and meshing `ivith a gear 37 upon theshaft 33 for reverse rotation.` f i A shifter `ar1n.38, having shifterblock connection to an annular groove 39 in the sliding gear collar 40,is secured upon a short rock shaft 41 mounted in bearings 42 iii-.thehousing 2S and is onl the outside of the lion-sing provided with anol'ierating und in (lening .lever 43. A. spring latch 444 upon the lever43 is adapted to` lock .the `lever in holes 45, 45u and 451? in thehousing 28, locking the sliding` gears 31 and 32 in positionscorresponding `to forward rotation, neutral and reverse rotation of theintermediate shaft 33. l i

y This shaftis mounted in ball bearings 46 and 47 and transmits power tothe master transmission shaft 48 through the gears 34 and 37 and anintermediate gear 49, all

keyed to the shaft 33.` The shaft 48 is journaled in ball-bearings 5()and 50 and upon itssplinedmiddle portion it carries a sliding gear spool51, having gears 52, `53 and 54 adapted to be brought into mesh, one ata time, with the gears 34, 49 and 37 respectively. A shifter arm 55,having shifter block connection to an annular groove 56 in and lockingsaid tumbler, of gears mounted therein, a drive shaft having a pinionfor successively engaging said gears assaid tum-` bler is revolved, aplurality of herringbone` gears of different sizes mounted in said tuinbler between its bearings, a spindle,fa corresponding number ofherringbone gears mounted on said spindle and meshing successively withthe herringbone gears of said tumbler as it is revolved. y

5. The combination, with a frame, of a driving shaft mounted therein, amaster shaft having variable speed driving connections with said drivingshaft, a pinion on said master shaft, a'tumbler having bearings in saidframe, shafts having bearings in said tumbler and-gears thereon to meshsuccessively with said pinion, a Work spindle, and gears on said tumblershafts intermediate to their ends meshing with gears" on saidivorkspindle. i y

6. The combination, with a driving shaft, of an intermediate shafthaving a driving connection therewith, a master shafthaving variablespeed rdriving connections With said intermediate shaft, a pinionon saidmaster shaft, a tumbler having a plurality of planetary shafts, a gearon each of said planetary shafts in :position to be'brought into meshsuccessively With said master pinion when the tumbler` is rotated, aspindle, and `driving gears connecting said planetary shafts with saidspindle. i

` 7. The combination, witha drive'shaft, of an intermediate shaftgeared, thereto, a master shaft having a variable speed drivingyconnection with said intermediate shaft, a pinion on saidfmastershaft, arevoluble tumbler Vmounted eceentrically to `the axis of` said mastershaft and having a plurality of planetary shafts and gears `thereon tomesh successively With said master shaft pinion as said tumbler isrevolved, a spindle, and variable speed driving connections between saidspindle and said planetary shafts respectively. Y

8. rIhe combination, with a driving shaft, of an intermediate shafthaving a variable speed driving connection with said driving shaft, amaster shaft having a variable speed driving connection with saidintermediate shaft, a pinion on said master shaft, a revoluble tumblerand a plurality of planetary shafts mounted therein, gears on saidplanetary shaft mounted to mesh respectively with said master shaftpinion as said tumbler is revolved, means for locking said tumbler andspindle, and variable speed driving connections between said spindle andsaid planetary shafts. i

9. The combination, with a driving shaft, of an intermediate shaftgeared thereto, a master shaft having a variable speed driving ieonnectionwith said intermediate shaft, a

pinion mounted on said master shaft, a rev `shaft for said spiral gearand an adjustingand locking lever mounted on said spiral gear shaft forholding said tumbler in its adjusted positions, and a spindle havinggear connections with said planetary shafts.

10. The combination, withV adrive shaft, of a master shaft havingvariable speed idriv ing connections with said drive shaft, a pinion onsaid master shaft, a tumbler havingbearings and planetary shafts mountedin said tumbler, gears on said planetaryshaft, said tumbler beingmounted eccentrically with res-peet to said master shaft, and the gearsof said Vplaneti'iry shafts meshing suecessively with, said pinion andspindle, and

4driving connections between said planetary shaft andsaid spindle. i

l1.V The combination, with a frame,0f a driving shaft mounted therein, amaster shaft having variable speed driving connection with said drivingshaft, a pinion ou said `master shaftuatumbler iu the forni of a lskeleton cylinder journaled in said `frame,`-y

planetary shafts peripherally mounted in said tumbler, gears on saidplanetary shafts arranged to mesh successivelywith sai d pinion, aspindle, and driving connections be tween said planetary shafts andsaid'spindle.

i `12. The combination, ,with a driving shaft, of a master shaft havinga variable speed driving connection therewith, a pinion on said mastershaft, a tumbler having bearings, planetary shafts mounted in saidtumbler, gears on said planetary shafts mounted to mesh 4successivelywith said pinion` a spindle, gears mounted on said planetary shaftsintermediate to their ends and the bearings of said tumbler and havingdri vm ing connections with said spindle.

1?. The combination, with a driving shaft,

of a mastershafthaving variable speed driv ing connections therewith, apinion mounted on said master shaft, a tumbler comprising heads andperipherally arranged planetary` shafts connecting said heads, saidtumblers having bearings and gears on said shafts to mesh with saidmaster shaft pinion as said tumbler is revolved, a spindle, herringbonegears of varying sizes mounted on said spindle and corresponding gearsof varying (lli i no

sizes mounted on said panetary shaft to mesh i successively with thecorresponding gears of said spindle.

14. The combination, with a frame, of a driving shafty journaledtherein, a master shaft having a variable speed driving connection withsaid driving shaft, a pinion on said master shaft, a skeleton tumblermounted in said yframe and at one end of said master shattfand adyacent.said pinion, planetary shatts having bearings at each end in saidtumbler, gears mounted on said planetary shafts and meshing with thepinion oir' said master. shaft, a spindleand variable speed drivine'connections between said spindle and said planetary shaftsr-espeetiiiely.

l5. The' combination, with a column, ot a gear liousingniounted en oneside thereof, a bonnet secured to said lgear housing, a motor baseenclosed by Vsaid bonnet, a drive shaft journaled in said bonnet, amaster shaft having variable speed driving connections with said drivingshaft, pinion on said master shaft, a tumbler having bearings in saidcolumn, planetary shafts ljournaled in said tun'ibler, gears mounted onsaid shafts to mesh successively with said pinion as said tumbler isrevolved, a spindle adjacent said tumbler, and 'variable speed driving'connections between said spindle and said planetary shafts.

16. rlhe combination, with a column haviup,l a gear housing, of adriving shaft mounted in said column, an intermediate shaft above saiddriving shaft, a master shatt Aabove said intermediate shaft, variablespeed driving gears mounted to slide on said driving shaft andsaidmaster shaft,y gears on said intermediate shaft for engagen'ientrespectively ivitli the gears ot said driving-and master shafts, apinion on said master shaft, a tumbler journaled in said column,planetary shafts mounted in said tumbler, gears mounted on said shaftsto mesh With the pinion of saidinaster shaft, a spindle, and

vs iriable spee'ddrivingr connections between saidA spindle and ysaidplanetaryshafts for operating said spindle atditferent speeds.

1 7.r The Combination, with a drive shaft, of a master shaft having apinion thereon, a 'variable speed driving` connection between said drivesha-tt and said master shaft, a tumblerk having a plurality ot'bearings, shafts mounted in Vsaid tumbler-and having gears to meshsuccessivelyy With said pinion, a spindle, and variable speedV driving`connectionsbetiveen said spindle and said tumbler sha-tts intermediateto the bearings of said shafts in said tumbler. s

18. rllhecombination, with a drive shaft, ot a. revolving tumbler havinga plurality oit bearings, shafts ymount-ed inv said tun'ibler andhavingvariable speed driving Connections with .said drive shaft,spindle, and variable speed drivingconnections between said tumblershafts and said spindle.vr

1Q. The'combination with /a trame, of a tumbler journaled therein,shafts mounted in said tumbler and'havinfg vdriving connections f'xvithsaid drive shaft, a Workingr spindle having variable* speed driving`connections With said shafts. becoming operative successively assaid'tunibler is rotated,

means having an operatingflever for rotat-y ing` saidtumbler and alocking pin carried by said lever and adapted to enter sockets in saidtumbler tor locking,` it ,in its adjusted positions, said pin preventingthe ymovementot said lever to rotate said tumbler until it is released.

In Witness whereof, I have hereunto set my hand this 8th day of March,1920.

CONRAD M. CONRADSON.

(ill

